Malicious PDF — malware analysis report

Static analysis result for SHA-256 455df42160cc9e0d…

MALICIOUS

PDF

94.7 KB Created: 2021-08-05 00:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68539eea88319bcfe21d138831c54319 SHA-1: 43820512e3a072154177a30328c82503b3a35f96 SHA-256: 455df42160cc9e0d3bad966994bd13efd6416130a4889b21c7f88d64f92cbe9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=how+to+install+a+honeywell+humidifier+filter PDF link annotation
    • https://sanidom.pl/img/file/97124825640.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92c6eec28---38172904294.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/lunujekebigojiluzazuko.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/53b9d41ff97c06fbbfcc4e22cecbfc5e/vujivagawugeluligogo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa001ffd8---xaloxadir.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/tanenewobi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/babokozorewajof.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fb5eaa0a2d62386e9ade7984a9bb9473/89029899891.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kcdm655nqs00ujiv7epldks2i9/74744463840.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/t6d5a35ee18g0q7dr2gisholq5/tubamajegerirutesanejop.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jisasefosekus.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/pamigifo.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/rosizidujaxikuwu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72c182e25---jigagifenogikijetakerub.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5def9bd1e73924441a0702801598df71/92724906088.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/boparamisegal.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/bujafipupikovava.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/6801235895.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/1308502970.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49b49b92f---75226643877.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/85574048288.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f38b9e906---25851240173.pdfIn PDF document text
    • https://atrax.hr/files/fanabil.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/96028055807.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 10908 bytes
SHA-256: f7315696aef54ff337824988555aeaa33e6fec94155527c47fcdfd35c6ee0f94
font_01_sfnt_off00012548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12548 18040 bytes
SHA-256: 42259e818b76c02915f3f52919de532e7bc1b9e904b634e86151df92444ea5bf
font_02_sfnt_off000154d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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